Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result In file included from /usr/include/c++/4.4/algorithm:62, from user.cpp:4: /usr/include/c++/4.4/bits/stl_algo.h: In function ‘const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&, _Compare) [with _Tp = std::pair<int, int>, _Compare = bool (*)(ii&, ii&)]’: /usr/include/c++/4.4/bits/stl_algo.h:2301: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = ii*, _Size = int, _Compare = bool (*)(ii&, ii&)]’ /usr/include/c++/4.4/bits/stl_algo.h:5258: instantiated from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = ii*, _Compare = bool (*)(ii&, ii&)]’ user.cpp:60: instantiated from here /usr/include/c++/4.4/bits/stl_algo.h:124: error: invalid initialization of reference of type ‘ii&’ from expression of type ‘const std::pair<int, int>’ /usr/include/c++/4.4/bits/stl_algo.h:125: error: invalid initialization of reference of type ‘ii&’ from expression of type ‘const std::pair<int, int>’ /usr/include/c++/4.4/bits/stl_algo.h:127: error: invalid initialization of reference of type ‘ii&’ from expression of type ‘const std::pair<int, int>’ /usr/include/c++/4.4/bits/stl_algo.h:131: error: invalid initialization of reference of type ‘ii&’ from expression of type ‘const std::pair<int, int>’ /usr/include/c++/4.4/bits/stl_algo.h:133: error: invalid initialization of reference of type ‘ii&’ from expression of type ‘const std::pair<int, int>’